<script setup lang="ts">
import { computed, ref, watch } from 'vue'
// 定义水果对象的类型
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}

// 水果列表
const defaultData = [
  {
    id: 1,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
    isChecked: true,
    num: 2,
    price: 6
  },
  {
    id: 2,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
    isChecked: false,
    num: 7,
    price: 20
  },
  {
    id: 3,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
    isChecked: false,
    num: 3,
    price: 40
  },
  {
    id: 4,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
    isChecked: false,
    num: 10,
    price: 3
  },
  {
    id: 5,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
    isChecked: false,
    num: 20,
    price: 34
  }
]
const fruitList = ref<Fruit[]>(defaultData)
const delGoods = (id: number) => {
  fruitList.value = fruitList.value.filter((item) => item.id !== id)
}

const localDataStr = localStorage.getItem('cart-data')
if (localDataStr && localDataStr !== '[]') {
  fruitList.value = JSON.parse(localDataStr) as Fruit[]
}
// 添加水果
const add = (id: number) => {
  // 1. 根据 id 找到数组中的对应项 → find
  const fruit = fruitList.value.find((item) => item.id === id)
  // 2. 操作 num 数量
  fruit && fruit.num++
}

// 删除水果
const sub = (id: number) => {
  // 1. 根据 id 找到数组中的对应项 → find
  const fruit = fruitList.value.find((item) => item.id === id)
  // 2. 操作 num 数量
  fruit && fruit.num--
}

const isAll = computed({
  get() {
    return fruitList.value.every((item) => item.isChecked)
  },
  set(value) {
    fruitList.value.forEach((item) => (item.isChecked = value))
  }
})
const total = computed(() => {
  return fruitList.value.filter((item) => item.isChecked).reduce((sum, item) => sum + item.num, 0)
})
const totalPrice = computed(() => {
  return fruitList.value
    .filter((item) => item.isChecked)
    .reduce((sum, item) => sum + item.num * item.price, 0)
})

// --------------------------------
// const person = { name: '张三', age: 18, gender: '男' }
// const setData = () => {
//   localStorage.setItem('person', JSON.stringify(person))
//   localStorage.setItem('key', JSON.stringify(123123124))
// }
// const getData = () => {
//   const str = localStorage.getItem('person')
//   console.log(JSON.parse(str));
// }
// const delData = () => {
//   localStorage.removeItem('person')
// }
// const clearData = () => {
//   localStorage.clear()
// }
watch(
  ()=>fruitList,
  (newData) => {
    localStorage.setItem('cart-data', JSON.stringify(newData.value))
  },
  {
    immediate: true,
    deep:true
  }
)
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box">
      <img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" />
    </div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div
            class="tr"
            v-for="item in fruitList"
            :key="item.id"
            :class="{ active: item.isChecked }"
          >
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="sub(item.id)" :disabled="item.num <= 1">-</button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="add(item.id)">+</button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td"><button @click="delGoods(item.id)">删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box"
            >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span
          >
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ total }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>

    <button @click="setData">存数据</button>
    <button @click="getData">取数据</button>
    <button @click="delData">删除数据</button>
    <button @click="clearData">清空数据</button>
  </div>
</template>

<style scoped>
@import './style/inputnumber.css';
@import './style/index.css';
</style>
